package com.broada.apm.template;

import java.lang.reflect.Field;

import org.springframework.aop.framework.AdvisedSupport;
import org.springframework.aop.framework.AopProxy;
import org.springframework.aop.support.AopUtils;

/**
 * 获取代理目标对象
 * @author jianfei.xu
 * @date   2016年4月8日
 *
 */
public class ProxyTargetUtils {
	
	/** 
     * 获取 目标对象 
     * @param proxy 代理对象 
     * @return  
     * @throws Exception 
     */
	public static Object getTarget(Object proxy) throws Exception {
        if(!AopUtils.isAopProxy(proxy)) return proxy; //不是代理对象  
        
        if(AopUtils.isJdkDynamicProxy(proxy)) return getJdkDynamicProxyTargetObject(proxy);  
        
        return getCglibProxyTargetObject(proxy); //cglib 
    }  
 
	protected static  Object getCglibProxyTargetObject(Object proxy) throws Exception {  
        Field h = proxy.getClass().getDeclaredField("CGLIB$CALLBACK_0");  
        h.setAccessible(true);  
        Object dynamicAdvisedInterceptor = h.get(proxy);  
        Field advised = dynamicAdvisedInterceptor.getClass().getDeclaredField("advised");  
        advised.setAccessible(true);  
        Object target = ((AdvisedSupport)advised.get(dynamicAdvisedInterceptor)).getTargetSource().getTarget();  
        return target;  
    }  
 
	protected static Object getJdkDynamicProxyTargetObject(Object proxy) throws Exception {  
        Field h = proxy.getClass().getSuperclass().getDeclaredField("h");  
        h.setAccessible(true);  
        AopProxy aopProxy = (AopProxy) h.get(proxy);  
        Field advised = aopProxy.getClass().getDeclaredField("advised");  
        advised.setAccessible(true);  
        Object target = ((AdvisedSupport)advised.get(aopProxy)).getTargetSource().getTarget();  
        return target;  
    }
	
}
